In an experiment to determine the factors affecting tensile strength in steel plates, the tensile strength (in kg/mm?), the manganese content (in parts per thousand), and the thickness (in mm) were measured for a sample of 20 plates. The following MINITAB output presents the results of fitting the model Tensile strength = Bo + B1 Manganese + B2 Thickness. The regression equation is Strength = 26.641 + 3.3201 Manganese – 0.4249 Thickness Predictor Coef StDev т Constant 26.6412.72340 9.78 0.000 Manganese 3.32010.33198 10.00 0.000 Thickness -0.42490.12606 -3.37 0.004 S = 0.8228 R-Sq = 86.2% R-Sq(adj) = 84.6% Analysis of Variance Source DF MS Regression Residual Error 1711.508 0.6769 2 72.0136.00553.190.000 Total 1983.517 Find a 95% confidence interval for the coefficient of Manganese. b. a. Find a 99% confidence interval for the coefficient of Thickness. Can you conclude that B1 > 3? Perform the appropriate hypothesis test. d. Can you conclude that B2 < -0.1? Perform the appropriate hypothesis test. C.

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In an experiment to determine the factors affecting tensile strength in steel plates, the tensile
strength (in kg/mm?), the manganese content (in parts per thousand), and the thickness (in
mm) were measured for a sample of 20 plates. The following MINITAB output presents the
results of fitting the model Tensile strength = Bo + B1 Manganese + B2 Thickness.
The regression equation is
Strength = 26.641 + 3.3201 Manganese – 0.4249 Thickness
Predictor
Coef StDev
т
Constant
26.6412.72340
9.78 0.000
Manganese 3.32010.33198 10.00 0.000
Thickness -0.42490.12606 -3.37 0.004
S = 0.8228 R-Sq = 86.2% R-Sq(adj) =
84.6%
Analysis of Variance
Source
DF
MS
Regression
Residual Error 1711.508 0.6769
2 72.0136.00553.190.000
Total
1983.517
Transcribed Image Text:In an experiment to determine the factors affecting tensile strength in steel plates, the tensile strength (in kg/mm?), the manganese content (in parts per thousand), and the thickness (in mm) were measured for a sample of 20 plates. The following MINITAB output presents the results of fitting the model Tensile strength = Bo + B1 Manganese + B2 Thickness. The regression equation is Strength = 26.641 + 3.3201 Manganese – 0.4249 Thickness Predictor Coef StDev т Constant 26.6412.72340 9.78 0.000 Manganese 3.32010.33198 10.00 0.000 Thickness -0.42490.12606 -3.37 0.004 S = 0.8228 R-Sq = 86.2% R-Sq(adj) = 84.6% Analysis of Variance Source DF MS Regression Residual Error 1711.508 0.6769 2 72.0136.00553.190.000 Total 1983.517
Find a 95% confidence interval for the coefficient of Manganese.
b.
a.
Find a 99% confidence interval for the coefficient of Thickness.
Can you conclude that B1 > 3? Perform the appropriate hypothesis test.
d.
Can you conclude that B2 < -0.1? Perform the appropriate hypothesis test.
C.
Transcribed Image Text:Find a 95% confidence interval for the coefficient of Manganese. b. a. Find a 99% confidence interval for the coefficient of Thickness. Can you conclude that B1 > 3? Perform the appropriate hypothesis test. d. Can you conclude that B2 < -0.1? Perform the appropriate hypothesis test. C.
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